Mac Mini HDMI or HDMI-DVI to Dreamcolor inquiry

Not sure where to post this...Anyways, i just got a Mac Mini 2012, it has HDMI out and an HDMI to DVI adapter. When i hook up the HDMI out directly to my HP Dreamcolor, it looks horrible. By using the HDMI to DVI adapter and hook it to the Dreamcolor DVI in looks much better. Anyone knows why ???